CN103658929A - Method for repairing and manufacturing bending roll in surfacing mode - Google Patents
Method for repairing and manufacturing bending roll in surfacing mode Download PDFInfo
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- CN103658929A CN103658929A CN201310680526.4A CN201310680526A CN103658929A CN 103658929 A CN103658929 A CN 103658929A CN 201310680526 A CN201310680526 A CN 201310680526A CN 103658929 A CN103658929 A CN 103658929A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention relates to a method for repairing and manufacturing a bending roll in a surfacing mode, and belongs to the technical field of surfacing. A surfacing method is provided, and a roll face cannot be stuck to steel after surfacing and is long in service life. The method includes the steps of selecting proper welding materials and adjusting process parameters for surfacing. The method is characterized in that the welding materials are a nickel-chromium-aluminum nickel base alloy flux-cored wire and a soldering flux matched with the nickel-chromium-aluminum nickel base alloy flux-cored wire, the surfacing rear deposition chemical content weight ratio is Cr:Al:Ni =6-8:6-8:80-86, surfacing includes the following steps of roll center pre-processing, flaw detection, process parameter adjusting and surfacing, machining and finished product detection. According to the method, the bending roll can be repaired and manufactured in a surfacing mode, preheating is needless before welding, surfacing of a transition layer is needless, heat preservation between layers is needless, surfacing steps are reduced, surfacing time is short, use quantities of the welding materials are small, and low-carbon and environment protection requirements are met.
Description
Technical field
The method of the present invention relates to built-up welding reparation, making bending roll, belongs to welding technology field.
Background technology
Hot continuous rolling Coil Box is installed between roughing end frame and finish rolling flying shear, and its work is that the intermediate blank that extreme trace is thrown after steel is not in the mood at a high speed coiling into a coil of strip, and then oppositely uncoiling, intermediate blank is delivered to mm finishing mill unit simultaneously and is rolled.In process of production, be speed production rhythm, the general working methods that adopt two stations of Coil Box: when the first frame of finish rolling is stung after steel, the steel-coil transferring that batches station, to the continuation uncoiling work of uncoiling station, is allowed and batches station and continue as and batch next intermediate blank and prepare.Bending roll is the critical component of Coil Box, and its Main Function is by the auxiliary rolling of the intermediate blank of rolling.Bending roll, before the work of batching starts and finishes, is bearing the high temperature of 1200～1300 ℃ always, and is bearing the friction of hot-rolled intermediate billet, and condition of work is very severe.Due to the particularity of condition of work, the service life of bending roll is short, is climbing the common less than of steel 3 months; And in use also steel bonding of roll surface, this directly affects the operating efficiency of milling train, the expense of the quality of steel, maintenance, finally affects the manufacturing cost of steel.
The technique of repairing at present, making bending roll is as follows: prepare the complicated technology flow processs such as roll centre → flaw detection → weld preheating → built-up welding transition zone insulation → built-up welding working lining the oiling of insulation → post weld heat treatment → postwelding machined → finished product detection → finished product, packing.The welding wire of built-up welding bending roll working lining is generally martensite type alloy welding wire at present, and above-mentioned martensite type deposited metal, has air quenching characteristic, is martensitic structure, and has Carbide Precipitation under high temperature built-up welding, and heap postwelding roll surface hardness reaches 45～55HRC.For meet repair hardness, metallographic structure stable, eliminate the requirements such as welding stress, postwelding needs heat treatment, makes particularly carbide disperse educt on the matrix of built-up welding working lining metal, and can form post-curing like this.Because the crack sensitivity of this class alloying component is high, need weld preheating, insulation and postheating measure in welding process simultaneously; In addition in order to improve fusion area performance, need built-up welding transition zone, afterwards built-up welding working lining again.Utilize this martensite type alloy welding wire heap postwelding, bending roll case hardness is higher than 45HRC, and in use still has short problem of roll surface steel bonding and service life.Because roll surface steel bonding meeting affects steel product quality, when serious, can cause bending roll to descend machine in advance, new roller is installed.Meanwhile, because above-mentioned overlaying method needs weld preheating and be incubated processing etc. in weld deposit process, wherein in preheating and insulation processing, temperature is generally 200～400 ℃, even higher temperature.For meeting the temperature requirement of weld deposit process, generally take the methods such as electrical heating, heated by gas, this makes built-up welding operating personnel's working environment extreme difference, is unfavorable for built-up welding reparation simultaneously, makes the stable of bending roll quality.Therefore, select suitable wlding and adopt a kind of convenience, easy-operating overlaying method to meet heap postwelding roll surface non-stick steel and long service life, this is important problems to technique for overlaying personnel.
Summary of the invention
A kind of method of the invention provides built-up welding reparation, making bending roll, the bending roll surface non-stick steel of heap postwelding is long service life simultaneously.
The method of built-up welding reparation of the present invention, making bending roll comprises selects suitable wlding and adjusting process parameter to carry out built-up welding work, it is characterized in that:
Described wlding is the solder flux of nickel chromium aluminum type nickel-base alloy flux-cored wire and the use that matches, and the deposited chemical component weight of heap postwelding is than being Cr ︰ Al ︰ Ni=6～8 ︰ 6～8 ︰ 80～86;
Described built-up welding work comprises the following steps: roll centre pretreatment → flaw detection → adjusting process parameter built-up welding → machined → product inspection.
Wherein, the crust of described nickel chromium aluminum type nickel-base alloy flux-cored wire is pure nickel band, and its Chinese medicine core is comprised of the component of following weight percentage: metallic aluminium 13.4～44.5%, crome metal: 12.6～42.2%, fluorite: 5～13.3%, metal nickel powder: 0～69%.
Concrete, above-mentioned flux-cored wire Chinese medicine core is comprised of the component of following weight percentage: metallic aluminium 22.2～36%, crome metal: 21～33%, fluorite: 5.8～10%, metal nickel powder: 21～61%.
Preferably, above-mentioned flux-cored wire Chinese medicine core is comprised of the component of following weight percentage: metallic aluminium 26.8～31.4%, crome metal: 24.6～28.8%, fluorite: 7.6～8.8%, metal nickel powder: 31～41%.
Concrete, in the medicine core of above-mentioned flux-cored wire, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 40～60 orders, crome metal: 70～90 orders, fluorite: 50～70 orders, metal nickel powder: 100～140 orders.
Preferably, in medicine core, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 50 orders, crome metal: 80 orders, fluorite: 60 orders, metal nickel powder: 120 orders.
Wherein, to account for the ratio of flux-cored wire gross weight be 20～50% to the weight of described nickel chromium aluminum type nickel-base alloy flux-cored wire Chinese medicine core.
Above-mentioned flux-cored wire is made according to the preparation method of general flux-cored wire, be specially: take pure nickel band as crust raw material, using metallic aluminium, crome metal, fluorite and metal nickel powder as drug core component, through nickel strap cutting, nickel strap deoil dry, medicine core batching is dry, rolling, medicine core are inserted in crust, and wire drawing becomes the flux-cored wire of different-diameter specification.
Adopt above-mentioned flux-cored wire built-up welding bending roll, the metallic gold phase constitution of built-up welding working lining is austenite, and because austenite metallographic structure has flow harden performance, postwelding, to working lining cure process, can further improve the hardness of roll surface.Concrete, heap postwelding working lining hardness is greater than 32HRC, and by it being carried out to flow harden processing after follow-up turning processing, roll surface hardness is greater than 54HRC, and this meets the upper machine job requirement of bending roll completely.Compare with overlaying method before simultaneously, the metallographic structure that wlding formed at built-up welding working lining is in the past the structure that martensite adds carbide, and this just need to guarantee to repair, make the requirement of the quality of bending roll and the hardness of built-up welding working lining by operations such as weld preheating, interlayer insulation, post weld heat treatment.But the overlaying method heap postwelding before adopting, roll surface steel bonding problem is still unresolved, and service life is short simultaneously.
Wherein, described roll centre pretreatment is that old roller turning or new roller are made.
Concrete, described old roller turning, take old roller as roll centre, the fatigue layer on old roller surface and blemish turning is clean, making roll surface diameter is (D-6) mm, within the scope of bending roll finished diameter, reserves the working lining of 6mm, and wherein D is the diameter (same afterwards) of bending roll finished product.If after turning surface fatigue layer and blemish, roll centre diameter does not meet (D-6) mm, will carry out soldering heap and be welded to this size.
Concrete, described new roller is made, and adopts a kind of low-carbon alloy forged steel of obdurability or middle carbon alloy forged steel to make new roller, and built-up welding is (D-6) mm by roll surface diameter, within the scope of bending roll finished diameter, reserve the working lining of 6mm, wherein tolerance is ± 0.10mm.
Wherein, flaw detection in built-up welding work, adopts magnetic particle testing blemish, and ultrasonic examination checks internal flaw, and while wherein not affecting the defect of built-up welding operation and use, flaw detection is qualified, then carries out follow-up built-up welding work.
Concrete, above-mentioned flaw detection, if bending roll (comprising roll centre inside and roll surface) has serious internal injury, does not allow to carry out built-up welding work again, reselects other old rollers, then carries out turning and flaw detection.
Wherein, adjusting process parameter in built-up welding work, is specially and adjusts welding current, weldingvoltage, speed of welding, dry extension of electrode, the rearmounted amount of welding wire, amount of lap etc.By adjusting above-mentioned built-up welding condition, accurately control built-up welding running parameter and make built-up welding everything goes well with your work, guarantee the quality of surfacing quality and bending roll finished product.
Wherein, built-up welding in built-up welding work, before weldering, built-up welding removing surface is clean, adopt automatic submerged-arc welding method, with nickel chromium aluminum type nickel-base alloy flux-cored wire and coupling solder flux, carry out built-up welding work, along the cylindrical surface built-up welding of bending roll, make roll surface diameter be at least (D+2～5) mm, be that many built-up welding 2～5mm keep for follow-up machining steps, wherein roll surface is smooth, guarantees that effective used thickness of roll surface radial direction is no less than 3.0mm after bending roll machined simultaneously, and wherein tolerance is ± 0.05mm.
In built-up welding work, first that built-up welding surface clean is clean, guarantee without greasy dirt, without moisture and other foreign material, then adopt above-mentioned wlding and method to carry out built-up welding.Because built-up welding surface cleaning, during built-up welding, in welding wire, deposited chemical composition can not polluted, and guarantees physics, the stable chemical nature of weld.If cleaning of surfaces to be welded is unclean, at built-up welding working lining, place there will be the defects such as white point, pore.
Adopt above-mentioned nickel chromium aluminum type nickel-base alloy flux-cored wire built-up welding reparation, make bending roll.Bending roll after upper machine is auxiliary intermediate blank rolling under the high temperature of 1200～1300 ℃, because the pure nickel band of metallic aluminium, crome metal and metallic nickel and crust in above-mentioned flux-cored wire is all high temperature alloy element, through heap postwelding roll surface, there is high-temperature stability and high hardness; Simultaneously, the chemical component difference of the chemical composition of deposited metal and rolling intermediate blank (mostly wherein being ordinary carbon steel) is large, both institutional framework difference is large, and this has also determined bending roll roll surface and coil of strip, and at high temperature interactional possibility is little, and this fundamentally solves the problem of roll surface steel bonding.Therefore, the bending roll long service life of heap postwelding.Inventor draws by a large amount of built-up welding working practices, when after built-up welding, effective used thickness of the roll surface radial direction of bending roll is not less than 3.0mm, just be doubled and redoubled the service life of bending roll, before being specially 3～4 times of service life of overlaying method and more than.
Wherein, machined in built-up welding work, when the bending roll of heap postwelding is cooled to room temperature, then carries out turning and flow harden and processes that to make roll surface diameter be D mm, and tolerance is ± 0.10mm.After processing like this, bending roll case hardness further increases, and substantially meets the specification requirement that bending roll uses on the machine.Concrete, as the roll surface hardness >=52HRC of bending roll, and meet wear-resisting requirement, just allow bending roll to use on the machine.
Wherein, product inspection in built-up welding work, carries out magnetic powder detection by bending roll finished product after built-up welding, and it is qualified wherein without slag inclusion, incomplete fusion, defects i.e.cracks, to be, then by qualified bending roll oil surface, packing with stand-by.
In the process of employing said method built-up welding bending roll, do not need the steps such as weld preheating, working lining insulation, built-up welding transition zone and post weld heat treatment.Because it is austenite that overlaying method of the present invention adopts the metallic gold phase constitution of nickel chromium aluminum type nickel-base alloy flux-cored wire heap postwelding working lining, in welding process, do not undergo phase transition; The good toughness of fusion area after above-mentioned welding wire built-up welding simultaneously, roll surface not easy fracture, wearing layer is incrust, and built-up welding working lining structure property is stable, welding stress is little, does not need post weld heat treatment.
Overlaying method before adopting, weld preheating is necessary operation, the main purpose of preheating is to reduce the cooling velocity of deposited metal heat affected area in weld deposit process, reduces tendency of hardenability and reduces welding stress, prevents that mother metal and deposited metal from cracking in weld deposit process.In weld deposit process, need insulation to process, to avoid deposited metal generation martensite phase transformation and quenching effect, improve the toughness of base metal fusion zone, prevent that roll surface fracture or wearing layer from peeling off simultaneously.Must there is post weld heat treatment, to improve postwelding tissue, to eliminate welding stress effect etc. simultaneously.
In overlaying method, welding wire was martensite type alloy welding wire in the past, for guaranteeing built-up welding service behaviour and deposited chemical composition requirement, needed built-up welding transition zone and working lining, simultaneously working lining conventionally need three layers of built-up welding and more than.And overlaying method of the present invention only needs built-up welding working lining, and guarantee that effective used thickness of the rear roll surface radial direction of bending roll finished product processing is not less than 3.0mm, the long service life of bending roll and in use non-stick steel.Therefore the inventive method built-up welding workload is few, the working time is short and save wlding and energy consumption.
The invention has the beneficial effects as follows:
1, built-up welding reparation of the present invention, to make bending roll method step simple, compares with overlaying method before, saves the steps such as weld preheating, built-up welding transition zone, interlayer insulation, post weld heat treatment and save energy consumption.
2, built-up welding reparation of the present invention, make bending roll method, only need to guarantee that effective used thickness of the roll surface radial direction of bending roll after built-up welding is not less than 3.0mm, just can significantly improve its service life, and non-stick steel in use.Compared with former overlaying method, built-up welding workload is few, wlding consumption is few, repair time is short.
3, overlaying method of the present invention is repaired after bending roll, only the dirt of roll surface need be cleaned up, without turning fatigue layer, in the situation that guaranteeing that matrix does not affect familiar lacunas, by the direct built-up welding of the inventive method in follow-up repair process.Reduce like this pre-treatment step, reduce workload.
The specific embodiment
The invention provides a kind of easy to operate, the simple built-up welding bending roll of flow process method, its key is to select suitable wlding and adjusts bead-welding technology parameter and carry out built-up welding work.
Bending roll is repaired in the inventive method built-up welding, take old roller as roll centre, and the fatigue layer of old curved surface and blemish turning is clean, and making roll surface diameter is (D-6) mm, within the scope of bending roll finished diameter, reserve the working lining of 6mm, wherein tolerance is ± 0.10mm.After flaw detection is qualified, the dirt on built-up welding surface is cleaned out, by adjusting bead-welding technology parameter, carry out built-up welding to make roll surface diameter be (D+2～5) mm, be i.e. many built-up welding 2～5mm within the scope of bending roll finished diameter.Then when bending roll is cooled to after room temperature, carry out turning, flow harden processing, making roll surface diameter is D mm, and tolerance is ± 0.10mm.Finally carry out magnetic powder detection, wherein without slag inclusion, incomplete fusion, do not have the weld defects such as crackle to be qualified finished product, then carry out oiling, packing is waited for and to be used on the machine.
Bending roll is made in the inventive method built-up welding, adopt low-carbon alloy forged steel or the middle carbon alloy forged steel that a kind of obdurability meets the demands to make new roller, then along the cylindrical surface built-up welding of bending roll, making roll surface diameter is (D-6) mm, within the scope of bending roll finished diameter, reserve the working lining of 6mm, wherein tolerance is ± 0.10mm.Through the qualified laggard windrow weldering of flaw detection, first the dirt on built-up welding surface is cleaned out, and adjusted bead-welding technology parameter and carry out built-up welding to make roll surface diameter be (D+2～5) mm.Then when bending roll is cooled to after room temperature, carry out turning, flow harden processing, making roll surface diameter is D mm, and tolerance is ± 0.10mm.Finally by magnetic powder detection, without slag inclusion, incomplete fusion, do not have the weld defects such as crackle to be qualified finished product, then carry out oiling, packing is waited for and being used on the machine.
Wherein, the wlding of above-mentioned built-up welding reparation, making bending roll is nickel chromium aluminum type nickel-base alloy flux-cored wire, and wherein mating solder flux is HJ107 or SJ601.Concrete, the crust of flux-cored wire is pure nickel band, medicine core is comprised of the component of following weight percentage: metallic aluminium 13.4～44.5%, crome metal: 12.6～42.2%, fluorite: 5～13.3%, metal nickel powder: 0～69%, and the deposited chemical component weight ratio of heap postwelding is: Cr ︰ Al ︰ Ni=6～8 ︰ 6～8 ︰ 80～86.
Preferably, above-mentioned flux-cored wire Chinese medicine core is comprised of the component of following weight percentage: metallic aluminium 22.2～36%, crome metal: 21～33%, fluorite: 5.8～10%, metal nickel powder: 21～61%.
Preferably, above-mentioned flux-cored wire Chinese medicine core is comprised of the component of following weight percentage: metallic aluminium 26.8～31.4%, crome metal: 24.6～28.8%, fluorite: 7.6～8.8%, metal nickel powder: 31～41%.
Concrete, in the medicine core of above-mentioned flux-cored wire, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 40～60 orders, crome metal: 70～90 orders, fluorite: 50～70 orders, metal nickel powder: 100～140 orders.
Preferably, in medicine core, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 50 orders, crome metal: 80 orders, fluorite: 60 orders, metal nickel powder: 120 orders.
Wherein, to account for the ratio of flux-cored wire gross weight be 20～50% to the weight of above-mentioned flux-cored wire Chinese medicine core.
The preparation method of above-mentioned flux-cored wire is: take pure nickel band as crust raw material, using metallic aluminium, crome metal, fluorite and metal nickel powder as drug core component, through nickel strap cutting, nickel strap deoil dry, medicine core batching is dry, nickel strap rolling, medicine core are inserted in crust, and wire drawing becomes the flux-cored wire of different-diameter specification.
Adopt above-mentioned overlaying method built-up welding bending roll, after bending roll machined during effective used thickness >=3.0mm of roll surface radial direction, be greater than 1 year the service life of bending roll, obviously than the long service life of the bending roll of former overlaying method reparation, making, and roll surface non-stick steel.
Inventor is from the operation of actual factory, and the equipment wherein relating to and condition should not be construed as restriction of the present invention.Those of ordinary skills, according to such scheme, can also make various forms of modifications, replacement, change.Every modification of doing based on above-mentioned technological thought, replacement and change all belong to protection scope of the present invention.
Embodiment
1, the component of flux-cored wire and preparation in the present invention
It is crust raw material that flux-cored wire of the present invention be take the nickel strap that thickness is 8.0～16.0mm as 0.3～0.8mm, width, using metallic aluminium, crome metal, fluorite and metal nickel powder as medicine core component, process nickel strap is cut out and is with, nickel strap deoils oven dry, medicine core component dry, nickel strap is rolled into U-shaped and loads wherein medicine core, and then be rolled into O type, be finally drawn into the flux-cored wire that diameter is 2.0～4.0mm.By adjusting the weight of crust and medicine core component, make each routine flux-cored wire in table 1.
The flux-cored wire of table 1 heterogeneity proportioning
In table 1, Bao Fenliang refers to that medicine core weight accounts for the ratio of welding wire gross weight, each component of table Chinese medicine core is weight percentage, and in table, the particle diameter unit of metallic aluminium, crome metal, fluorite and metal nickel powder is order, is weight ratio in table in deposited chemical composition between Al, Cr, Ni.
2, adopt above-mentioned flux-cored wire built-up welding to repair bending roll
Bending roll is repaired in the built-up welding of take below, and as example, the present invention is further elaborated.Bending roll roll surface trimmed size after reparation is that ф 420mm х 1450mm(is that roll surface diameter is ф 420mm, the long 1450mm of roll surface)
It is that bending roll is repaired in the built-up welding of Ф 2.5mm flux-cored wire that embodiment 1 selects gage of wire
Wlding: the nickel chromium aluminum type nickel-base alloy flux-cored wire made from example in table 13 and HJ107 coupling solder flux.
Technological process: roll centre pretreatment → flaw detection → adjusting process parameter built-up welding → machined → product inspection.
Wherein bead-welding technology parameter is as follows:
Electric power polarity: DC reverse connection;
Welding current: 220～260A;
Weldingvoltage: 28～32V;
Speed of welding: 200～250mm/min;
Dry extension of electrode: 25～28mm;
The rearmounted amount of welding wire: 25～30mm;
Amount of lap: adjacent welding bead overlap joint 50-60%.
Effective used thickness: 3.0mm; Welding wire consumption: 76kg; Coupling solder flux consumption: 92kg; Repair time: 85h.
Concrete operations: adopt submerged arc overlay welding method and above-mentioned welding wire to carry out built-up welding under above-mentioned bead-welding technology condition.By old roller turning to roll surface diameter, be Ф 414mm before built-up welding, 1～2 layer of built-up welding, heap postwelding roll surface diameter is Ф 422～423mm, finally by the finished diameter of bending roll after the subsequent treatment such as turning, flow harden, is 420mm; Wherein tolerance is ± 0.10mm.
Bending roll non-stick steel and use after 371 days and have no damage vestige in use after built-up welding.
It is that bending roll is repaired in the built-up welding of Ф 3.2mm flux-cored wire that embodiment 2 selects specification
Wlding: the nickel chromium aluminum type nickel-base alloy flux-cored wire made from example in table 15 and HJ107 coupling solder flux.
Technological process: roll centre pretreatment → flaw detection → adjusting process parameter built-up welding → machined → product inspection.
Wherein bead-welding technology parameter is as follows:
Electric power polarity: DC reverse connection;
Welding current: 260～320A;
Weldingvoltage: 29～33V;
Speed of welding: 300～350mm/min;
Stem elongation: 28～30mm;
The rearmounted amount of welding wire: 28～30mm;
Amount of lap: adjacent welding bead overlap joint 50～60%.
Effective used thickness: 3.0mm; Welding wire consumption: 80kg; Coupling solder flux consumption: 96.5kg; Repair time: 77h.
Concrete operations: adopt submerged arc overlay welding method and above-mentioned welding wire to carry out built-up welding under above-mentioned bead-welding technology condition.By old roller turning to roll surface diameter, be Ф 414mm before built-up welding, 1～2 layer of built-up welding, heap postwelding roll surface diameter is Ф 422.5～423.1mm, finally by processing such as turning, flow harden afterwards the finished diameter of bending roll be Ф 420mm, wherein tolerance is ± 0.10mm.
Bending roll non-stick steel and use after 383 days and have no damage vestige in use after built-up welding.
It is that Ф 4.0mm flux-cored wire carries out built-up welding that embodiment 3 selects diameter, repairs bending roll
Wlding: the nickel chromium aluminum type nickel-base alloy flux-cored wire made from example in table 17 and HJ107 coupling solder flux.。
Technological process: roll centre pretreatment → flaw detection → adjusting process parameter built-up welding → machined → product inspection.
Wherein bead-welding technology parameter is as follows:
Electric power polarity: DC reverse connection;
Welding current: 350～420A;
Weldingvoltage: 29～33V;
Speed of welding: 350～450mm/min;
Dry extension of electrode: 30～35mm;
The rearmounted amount of welding wire: 30～35mm;
Amount of lap: adjacent welding bead overlap joint 50～60%.
Effective used thickness: 3.1mm; Welding wire consumption: 82kg; Coupling solder flux consumption: 99kg; Repair time: 70h.
Concrete operations: adopt submerged arc overlay welding method and above-mentioned welding wire to carry out built-up welding under above-mentioned bead-welding technology condition.By old roller turning to roll surface diameter, be Ф 414.1mm before built-up welding, 1～2 layer of built-up welding, heap postwelding roll surface diameter is Ф 423～423.5mm, finally by processing such as turning, flow harden afterwards the finished diameter of bending roll be Ф 420.1mm, wherein tolerance is ± 0.10mm.
Bending roll after built-up welding reparation is non-stick steel and use after 377 days and have no damage vestige in use.
Before comparative example 1, the method for bending roll is repaired in built-up welding
Welding material: the Multipass104 (gage of wire is Ф 4.0mm) of take is welding wire, and wherein mating solder flux is HJ431 built-up welding transition zone, the Delstain423 (gage of wire is Ф 4.0mm) of take is welding wire, coupling solder flux is HJ107 built-up welding working lining.
Technological process: roll centre pretreatment → flaw detection → weld preheating → built-up welding transition zone insulation → built-up welding working lining insulation → post weld heat treatment → turning → product inspection.
Built-up welding concrete technology parameter:
Electric power polarity: DC reverse connection;
Welding current: 350～420A;
Weldingvoltage: 29～33V;
Speed of welding: 350～450mm/min;
Dry extension of electrode: 30～35mm;
The rearmounted amount of welding wire: 30～35mm;
Amount of lap: adjacent welding bead overlap joint 50～60%;
The temperature of interlayer insulation: 300～350 ℃.
Effective used thickness: 7.7mm; Welding wire consumption: 180kg; Coupling solder flux consumption: 220kg; Repair time: 160h.
Concrete operations: adopt submerged arc overlay welding method and above-mentioned welding wire to carry out built-up welding under above-mentioned bead-welding technology condition.Before weldering, by roll surface turning to diameter, be Ф 400～402mm; Built-up welding one deck transition zone, roll surface diameter is Ф 406mm; Built-up welding working lining again, making roll surface diameter is Ф 424～425mm, finally by the finished diameter of bending roll after the processing such as turning, flow harden, is Ф 420mm, wherein tolerance is ± 0.10mm.
In use still there is steel bonding phenomenon and use the vestige that has damage after 76 days in the bending roll of heap postwelding.
By above-described embodiment and comparative example, can be found out, utilize the inventive method to carry out built-up welding and repair after bending roll, roll surface non-stick steel and service life rise appreciably.Can infer simultaneously and to utilize above-mentioned overlaying method to make after bending roll also non-stick steel and long service life.The method of method built-up welding reparation of the present invention, making bending roll is compared with overlaying method before: in weld deposit process, save the operations such as weld preheating, built-up welding transition zone, interlayer insulation, post weld heat treatment.Under the prerequisite of mother metal of repairing same amount, wlding use amount is little, repair time is short, also reaches environmental protection, effect that energy consumption is low simultaneously.
Claims (9)
1. the method for built-up welding reparation, making bending roll comprises selects suitable wlding and adjusting process parameter to enter built-up welding work, it is characterized in that:
Described wlding is the solder flux of nickel chromium aluminum type nickel-base alloy flux-cored wire and the use that matches, and the deposited chemical component weight ratio of heap postwelding is: Cr ︰ Al ︰ Ni=6～8 ︰ 6～8 ︰ 80～86;
Described built-up welding work comprises the following steps: roll centre pretreatment → flaw detection → adjusting process parameter built-up welding → machined → product inspection.
2. built-up welding reparation according to claim 1, the method for making bending roll, it is characterized in that: the crust of described nickel chromium aluminum type nickel-base alloy flux-cored wire is pure nickel band, and medicine core is comprised of the component of following weight percentage: metallic aluminium 13.4～44.5%, crome metal: 12.6～42.2%, fluorite: 5～13.3%, metal nickel powder: 0～69%.
3. built-up welding reparation according to claim 1, the method for making bending roll, it is characterized in that: the crust of described nickel chromium aluminum type nickel-base alloy flux-cored wire is pure nickel band, and medicine core is comprised of the component of following weight percentage: metallic aluminium 22.2～36%, crome metal: 21～33%, fluorite: 5.8～10%, metal nickel powder: 21～61%.
4. built-up welding reparation according to claim 1, the method for making bending roll, it is characterized in that: the crust of described nickel chromium aluminum type nickel-base alloy flux-cored wire is pure nickel band, and medicine core is comprised of the component of following weight percentage: metallic aluminium 26.8～31.4%, crome metal: 24.6～28.8%, fluorite: 7.6～8.8%, metal nickel powder: 31～41%.
5. built-up welding reparation according to claim 1, the method for making bending roll, is characterized in that: in the medicine core of described nickel chromium aluminum type nickel-base alloy flux-cored wire, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 40～60 orders, crome metal: 70～90 orders, fluorite: 50～70 orders, metal nickel powder: 100～140 orders.
6. built-up welding reparation according to claim 1, the method for making bending roll, is characterized in that: in the medicine core of described nickel chromium aluminum type nickel-base alloy flux-cored wire, the particle diameter of metallic aluminium, crome metal, fluorite and metal nickel powder is respectively: metallic aluminium: 50 orders, crome metal: 80 orders, fluorite: 60 orders, metal nickel powder: 120 orders.
7. built-up welding reparation according to claim 1, the method for making bending roll, is characterized in that: the ratio that the weight of described nickel chromium aluminum type nickel-base alloy flux-cored wire Chinese medicine core accounts for flux-cored wire gross weight is 20～50%.
8. built-up welding reparation according to claim 1, the method for making bending roll, it is characterized in that: described built-up welding, before weldering, built-up welding removing surface is clean, adjust bead-welding technology parameter, with nickel chromium aluminum type nickel-base alloy flux-cored wire and the built-up welding of coupling solder flux, make roll surface diameter be at least D+2～5mm, wherein D is bending roll finished diameter, and the working lining of at least reserved 2～5mm is given follow-up machining steps.
9. built-up welding reparation according to claim 1, the method for making bending roll, is characterized in that: described machined, and until the bending roll of built-up welding, be cooled to after room temperature, then carry out turning and flow harden and process that to make roll surface diameter be D mm, tolerance is ± 0.1mm; Effective used thickness >=3mm of while bending roll finished product radial direction, wherein tolerance is ± 0.05mm.
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| CN110049843A (en) * | 2016-12-09 | 2019-07-23 | 西门子股份公司 | CMT technology with flux-cored wire conveying |
| CN110252463A (en) * | 2019-06-24 | 2019-09-20 | 郑州机械研究所有限公司 | A kind of abrasion-proof structure and preparation method thereof being easily repaired |
| CN113263053A (en) * | 2020-02-16 | 2021-08-17 | 晟通科技集团有限公司 | Repairing method for plate roller of foil rolling mill |
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